In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it …
CVE-2026-72253 · published 15 Aug 2026
How serious is it
- Severity: high, CVSS score 7.5 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-72253?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 4.3
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conntrack_sip: validate skb_dst() before accessing it
tc ingress and openvswitch do not guarantee routing information to be
available. These subsystems use the conntrack helper infrastructure, and
the SIP helper relies on the skb_dst() to be present if
sip_external_media is set to 1 (which is disabled by default as a module
parameter).
This effectively disables the sip_external_media toggle for these
subsystems without resulting in a crash.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/09755dc62b026076b1d47f83489eb0547c8135e0
- git.kernel.org/stable/c/0aec339694a56e263d4b22475ff7211d40900830
- git.kernel.org/stable/c/7866116a040b3a23fb094e7d8f7ea3d61b3ac70b
- git.kernel.org/stable/c/b843a96252f672332837ea2ecb7c8db0acf68e20
- git.kernel.org/stable/c/c199ed687c00841daf60e9d131976958583a8c09
- git.kernel.org/stable/c/c5ef7228be04518d95591fc5369a9c554b19756d
- git.kernel.org/stable/c/e5e24a365a5e024efef63cc49abb345fbd4852c5
- git.kernel.org/stable/c/e64a48c50a1ff565a98c6a98d82b5b942868e76e
Merged from NVD. Last updated 23 Oct 2026. All vulnerabilities · RSS · JSON